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Hazardous exposures were investigated at Pacific Gas and Electric, Geysers Facility (SIC-493) in San Francisco, California on August 7, 1980. The evaluation was requested by an authorized representative of the International Brotherhood of Electrical Workers, Local 1245, on behalf of an unspecified number of workers concerned about incidences of heart attacks, colds, and other ailments. Personal and area air samples were analyzed, and medical questionnaires were sent to about 300 employees. Concentrations of vanadium-pentoxide (1314621), inorganic-mercury (7439976), inorganic-arsenic (7440382), nuisance dust, sodium-hydroxide (1310732), and acrylamide (79061) were all below NIOSH standards of 0.05, 0.05, 0.002, 15 (CAL-OSHA), 2.0, and 0.3 milligrams per cubic meter, respectively. Asbestos (1332214) concentrations were also below the NIOSH limit of 0.1 fibers per cubic centimeter. The reported heart attack incidence among the workers was not greater than that for the general population. Lack of a comparison group precluded investigation of the relationship between hypertension, stress, and heart attack. The authors conclude that no health hazard exists. They recommend worker training and education, use of protective equipment, and provision of portable eye wash facilities.